[red-root, -root]
a North American plant, Lachnanthes caroliniana (or L. tinctoria ), having sword-shaped leaves, woolly, yellowish flowers, and a red, root.
any of various other plants having red, roots, as the alkanet, Alkanna tinctoria, pigweed, Amaranthus retroflexus, and New Jersey tea, Ceanothus americanus.

1700–10, Americanism; red1 + root1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
redroot (ˈrɛdˌruːt)
1.  a bog plant, Lachnanthes tinctoria, of E North America, having woolly yellow flowers and roots that yield a red dye: family Haemodoraceae
2.  another name for pigweed

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
No populations of redroot pigweed were identified as herbicide resistant.
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